| 摘要: |
| 以2 a生金蒲桃（Xanthostemon chrysanthus）幼苗为材料，研究了全光照，50%遮阴，70%遮阴，90%遮阴4种遮阴处理对金蒲桃生长特性、生物量分配、光合生理变化的影响，结果表明：与自然光全处理对比，遮光极显著（P<0.01）地抑制了金蒲桃幼苗生物量的积累，遮光处理组叶片数量减少，叶生物量比下降，茎生物量比增加；光补偿点、光饱和点、暗呼吸速率和最大光合速率降低，光能利用效率低于全光照叶，强光下遮阴叶的净光合速率保持稳定。上述结果说明：遮阴处理后，金蒲桃在生长特性、生物量分配和光合参数上表现出对遮阴弱光的适应，表明金蒲桃是一种能广泛应用于各种光照条件的优良景观树种。 |
| 关键词: 金蒲桃 遮阴 生物量 光合特征 耐阴性 |
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| Effects of shading on growth and response characteristics of photosynthesis in Xanthostemon chrysanthus |
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CHEN Xue-mei,LIAO Yi,ZHANG Yu-kai and FENG Zhi-jian
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1.South China Agricultural University,1.South China Agricultural University,South China Agricultural University,1. South China Agricultural University
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| Abstract: |
| The growth?characteristics, biomass allocation and photosynthetic physiological changes of 2-year-old Xanthostemon chrysanthus were examined with 4 shade gradients: full natural light(FL), 50% shading(LS), 70% shading(MS), 90% shading(HS). The results showed that compared with?FL, shading inhibited the biomass accumulation of X. chrysanthus extremely significantly. Shading also reduced the leaf number and leaf mass ratio. However, stem mass ratio increased under shading condition. With shadign treatment, plants had lower light-compensation point, light-saturation point, dark photosynthetic rate and maximum?photosynthesis?rate, and photosynthetic rate of light-saturation was significantly lower. When given strong light, the net photosynthetic rate of the plants under irradiation shade remained stable. We concluded that X. Chrysanthus had the ability to adjust to shade in growth?characteristics, biomass allocation, characteristics of photosynthetic. It is showed that X. Chrysanthus is a good landscape tree species that could be widely used in various light conditions . |
| Key words: Xanthostemon chrysanthus shading biomass photosynthesis shade tolerance |
